Magnetic Particle Testing
It is applied only to the castings made from ferromagnetic metals. This method is useful for detecting the discontinuities at the surface of the casting or slightly below It. The defect s like cracks, holes and slag pockets are readily detected by this process. The casting to be tested is made a part of a strong magnetic path and magnetic powder of high permeability is spindled on the surface of the casting. When the casting is magnetized, the defects distort the magnetic lines of flux and thus show the presence, location and extent of the defect.
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